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• W2023488496 abstract "Abstract 1. 1. The hearts of the hibernating hedgehog, Arctic group squirrel, and Franklin ground squirrel have been studied electrocardiographically. 2. 2. Heart rate: 2.1. (a) Heart rates are best described during the periods when animals are going into, in, and coming out of hibernation. Heart rate can in these periods be shown with reference to time and body temperature. With reference to time they are cyclic in periods of several days. With reference to temperature the function is different going into hibernation than it is coming out of hibernation. 2.2. (b) Going into hibernation the heart shows a hyperirritability beginning at a body temperature of about 20°C., which precludes heart standstill as it would occur in most other mammals on cooling. In deep hibernation the heart rate is greatly slowed to values as low as 2.2 beats per minute but stabilizes at body temperatures somewhat above ambient temperatures, on an average 2.1° C. above ambient temperatures in the three species. The heart rate may show unusual patterns such as pairing of beats or beats in bursts. Coming out of hibernation the rise in heart rate precedes the rise in body temperature. 3. 3. Electrocardiograms: 3.1. (a) Since the heart rates have descended to very low values, the components of the electrocardiograms in deep hibernation in all three species have been greatly stretched or extended by comparison to the components of nonhibernating lightly anesthetized animals of the same species. The stretch or extension of these components is of the following order of magnitude: 3.1.1. (1) The T-P interval is lengthened far and beyond all other components. That is, the automaticity of the SA node is most particularly slowed in hibernation. 3.1.2. (2) The P-R interval is lengthened next most. That is, the conduction time is increased next most. 3.1.3. (3) The QRS interval, P interval, and Q-T interval are in decreasing order. The RS-T interval shows the least amount of extension or stretch due to hibernation. If this is strictly representative of a temperature effect, it may be an indication that the RS-T reflects the time of a cellular electrolytic reaction. It is reasonable that the Q-T stretch be intermediate in value between the QRS and RS-T since it is largely composed of these two intervals. 3.2. (b) Although complete heart block was not observed, a marked lengthening of the P-R interval (conduction time of the heart) does occur, primarily at hibernating body temperatures below 10° C." @default.
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• W2023488496 date "1955-03-01" @default.
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• W2023488496 title "Characteristics of the hibernating heart" @default.
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• W2023488496 doi "https://doi.org/10.1016/0002-8703(55)90031-4" @default.
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